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  Subjects -> CHEMISTRY (Total: 809 journals)
    - ANALYTICAL CHEMISTRY (48 journals)
    - CHEMISTRY (563 journals)
    - CRYSTALLOGRAPHY (22 journals)
    - ELECTROCHEMISTRY (25 journals)
    - INORGANIC CHEMISTRY (41 journals)
    - ORGANIC CHEMISTRY (45 journals)
    - PHYSICAL CHEMISTRY (65 journals)

ANALYTICAL CHEMISTRY (48 journals)

Accounts of Chemical Research     Full-text available via subscription   (Followers: 262)
ACS Combinatorial Science     Full-text available via subscription   (Followers: 9)
Acta Analytica     Hybrid Journal   (Followers: 7)
Advances in Analytical Chemistry     Open Access   (Followers: 20)
American Journal of Analytical Chemistry     Open Access   (Followers: 27)
Analytica Chimica Acta     Hybrid Journal   (Followers: 33)
Analytical and Bioanalytical Chemistry     Hybrid Journal   (Followers: 28)
Analytical Chemistry     Full-text available via subscription   (Followers: 364)
Analytical Chemistry Insights     Open Access   (Followers: 16)
Analytical Letters     Hybrid Journal   (Followers: 10)
Analytical Spectroscopy Library     Full-text available via subscription   (Followers: 10)
Annual Review of Analytical Chemistry     Full-text available via subscription   (Followers: 9)
Biomonitoring     Open Access  
Chinese Journal of Analytical Chemistry     Full-text available via subscription   (Followers: 3)
Combinatorial Chemistry - an Online Journal     Open Access   (Followers: 2)
Comprehensive Analytical Chemistry     Full-text available via subscription   (Followers: 5)
Critical Reviews in Analytical Chemistry     Hybrid Journal   (Followers: 25)
Current Analytical Chemistry     Hybrid Journal   (Followers: 6)
Drug Testing and Analysis     Hybrid Journal   (Followers: 5)
Electroanalysis     Hybrid Journal   (Followers: 4)
Field Analytical Chemistry and Technology     Hybrid Journal   (Followers: 5)
Handbook of Analytical Separations     Full-text available via subscription   (Followers: 1)
Handbook of Thermal Analysis and Calorimetry     Full-text available via subscription  
International Journal of Analytical Chemistry     Open Access   (Followers: 20)
International Journal of Chemical and Analytical Science     Full-text available via subscription   (Followers: 4)
International Journal of Environmental Analytical Chemistry     Hybrid Journal   (Followers: 6)
International Journal of Polymer Analysis and Characterization     Hybrid Journal   (Followers: 4)
ISRN Analytical Chemistry     Open Access   (Followers: 16)
ISRN Chromatography     Open Access   (Followers: 2)
Journal of Analytical & Bioanalytical Techniques     Open Access   (Followers: 5)
Journal of Analytical Atomic Spectrometry     Full-text available via subscription   (Followers: 9)
Journal of Analytical Chemistry     Hybrid Journal   (Followers: 15)
Journal of Electroanalytical Chemistry     Hybrid Journal   (Followers: 4)
Journal of Essential Oil Research     Hybrid Journal   (Followers: 2)
Journal of Radioanalytical and Nuclear Chemistry     Hybrid Journal   (Followers: 3)
Journal of Thermal Analysis and Calorimetry     Hybrid Journal   (Followers: 18)
Main Group Metal Chemistry     Full-text available via subscription   (Followers: 1)
Microchemical Journal     Hybrid Journal   (Followers: 3)
Phytochemical Analysis     Hybrid Journal   (Followers: 1)
Polish Journal of Chemical Technology     Open Access   (Followers: 2)
Reviews in Analytical Chemistry     Full-text available via subscription   (Followers: 7)
Sample Preparation     Open Access  
Surface and Interface Analysis     Hybrid Journal   (Followers: 14)
Techniques and Instrumentation in Analytical Chemistry     Full-text available via subscription   (Followers: 6)
TrAC Trends in Analytical Chemistry     Full-text available via subscription   (Followers: 20)
Trends in Environmental Analytical Chemistry     Hybrid Journal   (Followers: 1)
Vibrational Spectroscopy     Hybrid Journal   (Followers: 8)
World Journal of Analytical Chemistry     Open Access  
Journal Cover Journal of Analytical Chemistry     [SJR: 0.322]   [H-I: 17]
   [17 followers]  Follow    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1608-3199 - ISSN (Online) 1061-9348
   Published by Springer-Verlag Homepage  [2210 journals]
  • Electrochemical behavior and determination of
           guanosine-5′-monophosphate on a ionic liquid modified carbon
           electrode
    • Abstract: Abstract A carbon ionic liquid electrode (CILE) was constructed by using ionic liquid 1-butyl-3-meth-ylimidazolium dihydrogen phosphate, (BMIM)H 2 PO 4, as modifier and further employed as a novel working electrode for the determination of guanosine-5′-monophosphate (GMP). The study of electrochemical behavior of GMP on the CILE showed a single well-defined irreversible oxidation peak on the cyclic voltammogram. Under the selected conditions the oxidation peak current was proportional to GMP concentration in the range from 5.0 to 1000 μM with the limit of detection of 1.3 μM (3σ) by differential pulse voltammetry. The proposed method showed good selectivity to the GMP detection without the interferences of coexisting substances.
      PubDate: 2015-02-01
       
  • A sensitive chemiluminescence method for the determination of celecoxib in
           pharmaceutical and biological samples
    • Abstract: Abstract A simple and sensitive chemiluminometric method was developed for the determination of celecoxib, a nonsteroidal anti-inflammatory drug. It is based on the sensitization of Ce(IV)-Na2SO3 chemiluminescence reaction by celecoxib in the presence of Tb(III) ions. The mechanism of chemiluminescence reaction was studied by obtaining fluorescence and chemiluminescence spectra. The effects of various chemical parameters on chemiluminescence intensity were investigated and optimized. Under the optimum conditions, a linear relationship was obtained between the enhanced chemiluminescence intensity and the concentration of celecoxib in the range of 0.01–0.15 μg/mL, with a limit of detection of 2.5 ng/mL. Study of interferences confirmed the selectivity of the developed method for analysis of pharmaceutical and biological samples. The method was applied to the determination of celecoxib in pharmaceutical formulations and human plasma samples, and also to dissolution studies with satisfactory results.
      PubDate: 2015-02-01
       
  • Identification and analytical properties of acetyl fentanyl metabolites
    • Abstract: Abstract Acetyl fentanyl is a novel designer drug substance, a derivative of fentanyl. Its major metabolites were identified in samples of urine from consumers of acetyl fentanyl using gas chromatography and high-performance liquid chromatography with mass spectrometry detection. Structures of metabolites were proposed and confirmed by their fragmentation on electron impact and atmospheric pressure chemical ionization. The mass spectral and chromatographic properties of some derivatives of acetyl fentanyl metabolites were determined. The main path of the biotransformation of acetyl fentanyl is the hydroxylation of the phenylethyl moiety in the molecule.
      PubDate: 2015-02-01
       
  • Antioxidant activity of essential oil of Coriandrum sativum and
           standardization of HPTLC method for the estimation of major phytomarkers
    • Abstract: Abstract The essential oils of seed and whole plant of Coriandrum sativum were examined for their in vitro antioxidant activities which were found to be higher compared to different extracts of this plant. A simple, precise and specific HPTLC method has been developed for the determination of important phytomarkers of essential oils. The proposed method was validated in terms of linearity, precision, accuracy, limits of detection and quantification.
      PubDate: 2015-02-01
       
  • A new sorbent of modified MWCNT for solid phase extraction and
           determination of trace amount of palladium in environmental samples
    • Abstract: Abstract A simple method for separation and preconcentration of trace amount of palladium from aqueous medium prior to its flame atomic absorption spectrometric determination was developed. 4,4-Bis(dimethylamino)thiobenzophenone-modified multiwalled carbon nanotubes (MWCNTs) as a new solid phase extractant has been packed in a column. The modification process was fast and simple and the sorbent showed relatively fast kinetics of sorption of the target analyte. Various parameters influencing the preconcentration of Pd were optimized, including pH of the solution, flow rate of sample and eluent, type and concentration of eluent and breakthrough volume, also interferences were studied. The sorption capacity of oxidized MWCNTs for Pd(II) was 19.8 mg/g. Under optimum experimental conditions, linearity range was from 1.2 to 200 ng/mL, the limit of detection of this method for Pd was 0.4 ng/mL with an enrichment factor of 200, and the relative standard deviation (RSD) was 3.7% at the 50 ng/mL Pd level. The method was validated by the extraction and determination of Pd(II) in rain water, blood, dry tea and road dust samples.
      PubDate: 2015-02-01
       
  • Gas chromatographic determination of trace amounts of epibatidine and its
           biomarker in blood plasma
    • Abstract: Abstract A method has been developed for the determination of 2-endo(6′-chloropyridin-3′-yl)-7-azabicyclo[2.2.1]heptane (epibatidine) and 2-endo(6′-chloropyridin-3′-yl)-7-azabicyclo[2.2.1]heptane-7-ol (epibatidine biomarker) in blood plasma at a level of 1 × 10−5–1 × 10−3 mg/mL. The method is based on the extraction of components from blood plasma by liquid-liquid extraction followed by gas-chromatographic determination using thermionic or mass spectrometric detectors. To reduce the limit of detection for epibatidine and its biomarker in using the mass-spectrometric detector, a derivatization stage using N,O-bis(trimethylsilyl)trifluoroacetamide or 2,3,4,5,6-pentafluorobenzyl bromide has been included into the procedure.
      PubDate: 2015-02-01
       
  • Extraction of scandium by diantipyrylalkanes from naphthalene-2-sulfonate
           solutions in the extraction systems of different types
    • Abstract: Abstract The extraction of scandium by diantipyrylmethane, diantipyrylbutane, and diantipyrylheptane from naphthalene-2-sulfonic acid solutions in the systems of different types, including those without an organic solvent, was studied. The composition of extracted scandium complexes was determined. The constants of scandium extraction with 0.1 M solutions of diantipyrylalkanes in a 10% solution of isopentanol in chloroform were calculated. Diantipyrylmethane exhibited a maximum extraction capacity. A procedure for the extraction-chelatometric determination of scandium was developed with the use of the water-diantipyrylmethane-naphthalene-2-sulfonic acid segregable system.
      PubDate: 2015-02-01
       
  • Micellar-extraction preconcentration of aluminum(III) by phenol-induced
           phases of cetylpyridinium chloride
    • Abstract: Abstract The optimal conditions are selected for the preparation of compact liquid phases modified with phenol and electrolyte from solutions of cetylpyridinium chloride. The utility of such phases for analytical preconcentration is demonstrated on an example of an aluminum(III)-Chromazurol S complex. The effect of the concentration of the micellar-extraction system on the absorbance of the complex in solution is studied, and the optimal conditions for its extraction are found. It is shown that the performance of the hybrid procedure is improved by combining micellar extraction with cationic phases and optical detection methods. The procedures developed for the spectrophotometric and colorimetric determination of aluminum as a complex with Chromazurol S with micellar-extraction preconcentration are tested in the analysis of urine and blood plasma.
      PubDate: 2015-02-01
       
  • Determination of chloride and sulfate ions in high-purity water by
           capillary electrophoresis
    • Abstract: Abstract A method is developed for the determination of chloride and sulfate ions in trace concentrations in high-purity water by capillary electrophoresis. A leading electrolyte based on chromate ions is used for indirect photometric determination. Electrokinetic sample injection is utilized. The internal standard method is used to improve reproducibility, and the conditions of sample injection with field amplification using an aqueous plug are optimized. The method is validated on samples of distilled, twice-distilled, and deionized water. The accuracy of the results of analysis was verified by the added-found method. The analytical range for chloride and sulfate ions is 1–50 μg/L; the detection limit is 0.3 μg/L. The duration of one analysis is 4–5 min.
      PubDate: 2015-02-01
       
  • Simultaneous spectrophotometric determination of Ga(III) and Tl(III) by
           using genetic algorithm based on wavelength selection-partial least
           squares regression
    • Abstract: Abstract A method for simultaneous spectrophotometric determination of Ga(III) and Tl(III) based on their complexes with 4-(2-pyridylazo)-resorcinol (PAR) is proposed. The results of simultaneous determinations in mixture were obtained by using partial least squares regression (PLS) and genetic algorithm-partial least squares regression (GA-PLS). Moreover, the comparison between them has been conducted. The relative errors of prediction for Ga(III) and Tl(III) were calculated to be 4.98, 8.84 from PLS and 4.83, 4.82 due to running GA-PLS respectively. The pH effect on the sensitivity and selectivity was studied according to the net analyte signal (NAS) approach. The pH was selected at 5.5 as the optimum value to compromise the sensitivity and selectivity of these metal ions. As a consequence, the GA-PLS shows better prediction ability over full spectrum of PLS.
      PubDate: 2015-02-01
       
  • Capillary electrophoresis coupled with microdialysis for continuous
           monitoring of free metoprolol in rabbit blood
    • Abstract: Abstract A microdialysis method followed by a capillary electrophoresis (CE) procedure has been performed for the determination of metoprolol in rabbit blood. A microdialysis probe was inserted into the ear vein for blood sampling. The electrophoresis conditions were: 47 (40) cm × 50 μm silica capillary, 50 mM acetate buffer solution (pH 4.0), 10 s hydrodynamic load, detection wavelength 214 nm, run voltage 18 kV, temperature 25°C. The calibration was linear within the range of 1.0–100 μg/mL (r > 0.999). The limit of detection (LOD) was 0.5 μg/mL. Intra-day and inter-day repeatabilities with relative standard deviations (RSDs) ≤ 5.1% were obtained. The method was then applied to pharmacokinetics profiling of metoprolol in the blood following oral administration of metoprolol to rabbits.
      PubDate: 2015-02-01
       
  • Effect of the structure of d -metal rhodanide complexes on the selectivity
           of tetrarhodanocobaltate- and tetrarhodanozincate-selective electrodes
    • Abstract: Abstract Spectrometry in the visible and IR regions is used to study complex formation in aqueous solutions of rhodanides of bivalent cations Cd, Hg, Ni, Mn, Fe, Zn, and Co. It is found that Cd(II), Hg(II), Ni(II), and Fe(II) coordinate NCS− by the thiocyanate type; Zn(II), by the isothiocyanate type; and Co(II) and Mn(II) change their coordination mode depending on the concentration of KNCS in the solution. The effect of the structure of metal rhodanide complexes on the selectivity of Zn(NCS) 4 2− and Co(NCS) 4 2− -selective electrodes (SE) is revealed. It is shown that hydrophobic ions of Zn(NCS) 4 2− and ions (2.0 M)-Co(NCS) 4 2− , at high concentrations of KNCS (2.0 M) exhibit the strongest affinity to the membrane phase of electrodes. This ensures the selective potentiometric determination of zinc and cobalt on their simultaneous presence.
      PubDate: 2015-02-01
       
  • Cloud-point extraction preconcentration of sym -triazine herbicides to
           determination by gas chromatography
    • Abstract: Abstract The cloud-point extraction of a number of sym-triazine herbicides by phases of nonionic Triton X-114 surfactant is studied. Based on the data obtained, conditions were found for the gas-chromatographic determination of prometryn, propazine, semoran, and atrazine in waters and foods with cloud-point extraction preconcentration.
      PubDate: 2015-02-01
       
  • Photometric and fluorimetric determination of chromium(VI) using metal-oxo
           mediated reaction of 1-(2-hydroxyphenyl)thiourea in micellar medium
    • Abstract: Abstract This paper presents a novel approach for sensing chromium(VI) based on the oxidative dimerisation reaction of 1-(2-hydroxyphenyl)thiourea. The catalytic property of 2,2′-bipyridyl-chromium(VI)-oxo complex enhances the dimerisation process. The analytical parameters and kinetic studies were thoroughly studied and reported using spectrophotometric and spectrofluorometric techniques for the determination of chromium(VI). The analytical range is determined to be 0.3–250 ng/mL. The proposed methods for sensing chromium(VI) are fairly sensitive and were applied to wastewater samples. The obtained data is statistically treated, confirming the reliability of the methods.
      PubDate: 2015-02-01
       
  • Kinetic-spectrophotometric determination of neomycin
    • Abstract: Abstract A new kinetically-based spectrophotometric method for the determination of micro quantities of neomycin is described in this paper. It is an adaptation of the modified Berthelot method which is a widely used colorimetric procedure for urea determination. The method was developed due to neomycin effect on 2,2′-dicarboxyindophenol formation. The experimental conditions for successful determination of neomycin were optimized. The relative standard deviation (RSD) for the neomycin concentration interval of 77–154 μg/mL, ranges from 0.7 to 1%. The method was directly applied to determining neomycin in ophthalmic drops. The obtained results in analyzed pharmaceutical samples were in accordance with disc-diffusion microbiological method results.
      PubDate: 2015-02-01
       
  • Potentiometric determination of water-soluble antioxidants using metal
           complexes
    • Abstract: Abstract A new approach has been proposed to the determination of antioxidants using an oxidized form of metal in a complex compound as a model oxidizer. A method of the quantitative determination of antioxidants in aqueous solutions with RSD 2–4% has been developed.
      PubDate: 2015-02-01
       
  • Rapid gas-chromatographic determination of marking agents added to the
           industrial plastic explosives in air
    • Abstract: Abstract Results of the study of the conditions of detection of traces of marking agents added to industrial plastic explosives in air using preconcentration and subsequent analysis on a ECHO-V-IDVS modernized gas chromatograph with a polycapillary column, an ionization detector of a varying selectivity (IDVS), and atmospheric air as a carrier gas are presented. A significant effect of air humidity on the limits of detection for 4-nitrotoluene and 2,3-dimethyl-2,3-dinitrobutane is demonstrated; the highest IDVS sensitivity was observed at the humidity of the carrier gas less than 8.5 mg/m3. For the preconcentration of marking agents, concentrators based on Tenax adsorbent or those produced as metal wire grids coated with a stationary phase are most efficient. The limits of detection for vapors of marking agents in sampling 1 L of air to a concentrator are 22 pg/cm3 for 4-nitrotoluene and 0.1 pg/cm3 for 2,3-dimethyl-2,3-dinitrobutane.
      PubDate: 2015-02-01
       
  • Determination of iron and copper ions in cognacs by capillary
           electrophoresis
    • Abstract: Abstract A method is developed for the determination of iron(III) and copper(II) in cognacs by capillary electrophoresis (CE) with diode array detection with limits of detection 0.06 and 0.6 mg/L, respectively. Foreign substances present in cognac do not interfere with the determination. The accuracy of the results of analysis was confirmed by the added-found method. The method was applied to the analysis of seven cognac samples. The data obtained by CE are in a good agreement with the results of inductively coupled plasma mass spectrometry.
      PubDate: 2015-02-01
       
  • First derivative spectrophotometric determination of copper(II) and
           nickel(II) simultaneously using 1-(2-hydroxyphenyl)thiourea
    • Abstract: Abstract A sensitive simultaneous determination of copper(II) and nickel(II) was achieved using first derivative spectrophotometry based on zero-crossingover technique. In the current method, 1-(2-hydroxyphenyl)thiourea (HPTU) was used as a chromogenic reagent. To enhance the sensitivity in the method, pyridine was used as activator, cetyltrimethylammonium bromide (CTAB) and sodium dodecyl sulfate (SDS) were used as surfactants. Analytical parameters such as pH, reagent concentration, reaction time, etc., have been investigated. The ranges of determination for copper(II) and nickel(II) were 0.003–0.9 and 0.5–100 ng/mL, respectively. The proposed method was applied to plant samples for the determination of copper(II) and nickel(II) simultaneously.
      PubDate: 2015-02-01
       
  • Photometric redox determination of bromate ions in drinking water
    • Abstract: Abstract A procedure is developed for the selective photometric redox determination of bromate ions in drinking waters of different types. Methylene Blue (MB), Variamine Blue (VB) and Safranin T (SAF) are studied as irreversibly oxidized redox indicators. The limits of detection for bromate ions are 0.4 and 1 μg/L for MB (VB) and SAF, respectively. Using MB as an indicator at the concentration of bromate ions 1 μg/L, the acceptable mass ratios of concomitant ions are as follows: IO 3 − , NO 2 − (1: 60); ClO−, ClO 2 − (1: 100); ClO 3 − , ClO 4 − IO 4 − , Br− I− (1: 200). In the concentration range of bromate ions 1–10 μg/L, the total determination error is 5–7%.
      PubDate: 2015-02-01
       
 
 
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